// Entity Framework Classic

// Doc: https://entityframework-classic.net/bulk-merge

​

// @nuget: Z.EntityFramework.Classic

​

using System;

using System.Linq;

using System.Data.Entity;

using System.Threading.Tasks;

using System.Threading;

​

public class Program

{

    public static void Main()

    {

        MainAsync().Wait();

    }

    public static async Task MainAsync()

    {

        GenerateData();

​

        using (var context = new EntityContext())

        {

            // The first call perform a database round trip

            var countries1 = await context.Countries.CacheAsync().ConfigureAwait(false);

​

            // Subsequent calls will take the value from the memory instead

            var countries2 = await context.Countries.CacheAsync().ConfigureAwait(false);

            FiddleHelper.WriteTable(countries2);

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Countries.Add(new Country() { Name ="Customer_A" });

            context.Countries.Add(new Country() { Name ="Customer_B" });            

            context.Countries.Add(new Country() { Name ="Customer_C" });

            context.SaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

​

        }

        public DbSet<Country> Countries { get; set; }

    }

​

    public class Country

    {

        public int CountryID { get; set; }

        public string Name { get; set; }

    }

}